How to install for ALL users on a Mac
I don't use a Mac, but I think this question here answers it.


  It depends where it installs to.
  
  If it goes into the main Applications folder, then yes, it's available
  to all users - though each user will have their own distinct prefs,
  saved under their account.
  
  If it's installed to /Users/[your name]/Applications, then it's only
  available to that user


This here also seems relevant.